CN111219243A - Method of determining target boost pressure of exhaust gas turbocharged engine, storage medium - Google Patents

Method of determining target boost pressure of exhaust gas turbocharged engine, storage medium Download PDF

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CN111219243A
CN111219243A CN202010109549.XA CN202010109549A CN111219243A CN 111219243 A CN111219243 A CN 111219243A CN 202010109549 A CN202010109549 A CN 202010109549A CN 111219243 A CN111219243 A CN 111219243A
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Prior art keywords
pressure
target
intake pressure
target intake
boost pressure
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CN202010109549.XA
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CN111219243B (en
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秦龙
刘磊
田丰民
赵田芳
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

A method of determining a target boost pressure for an exhaust gas turbocharged engine is disclosed. Method, storage medium. The method comprises the steps of obtaining a target intake pressure of an engine, comparing the target intake pressure with a first set pressure, and determining whether to correct the target intake pressure to obtain a target supercharging pressure. The method determines whether the target intake pressure is corrected to determine the target supercharging pressure through the management of the target intake pressure, corrects and compensates the target intake pressure, determines a target supercharging pressure higher than the traditional target supercharging pressure in advance, and meets the requirement of torque in a short time. Meanwhile, in the process of compensating the target intake pressure (target supercharging pressure), transition compensation is avoided through the second set value, and the supercharging system is protected.

Description

Method of determining target boost pressure of exhaust gas turbocharged engine, storage medium
Technical Field
The invention belongs to a control technology of an exhaust gas supercharged engine, and particularly relates to a control technology of supercharging pressure of an engine.
Background
The supercharging control of the exhaust gas supercharged engine usually adopts the PID closed-loop control to realize the control of the target supercharging pressure. Ideally, the target boost pressure is a target intake pressure after the throttle. The determination of the target intake pressure and the target boost pressure is generally determined based on the torque demand of the engine, and responds to the torque request by increasing the engine intake air amount and the spark efficiency. However, under certain specific vehicle operating conditions, such as after gear shifting is completed, the requested torque is too large, torque response may not be satisfied in time through ignition angle adjustment, and if the conventional target boost pressure value is still used for control, the problem of short-time torque response failure occurs.
Disclosure of Invention
The invention aims to provide a method for determining a target boost pressure of an exhaust gas turbocharged engine, which is used for storing media, realizing advanced boost control and improving boost control.
One of the technical schemes of the invention is as follows: the method for determining the target supercharging pressure of the exhaust gas turbocharged engine comprises the steps of obtaining the target inlet pressure of the engine, comparing the target inlet pressure with a first set pressure, and determining whether the target inlet pressure is corrected to obtain the target supercharging pressure.
The further optimized technical scheme is as follows: and when the target air inlet pressure is smaller than a first set value, the target supercharging pressure is equal to the target air inlet pressure.
The further optimized technical scheme is as follows: and when the target intake pressure is equal to or greater than a first set value, the target supercharging pressure is equal to the sum of the target intake pressure and the compensation pressure.
The further optimized technical scheme is as follows: and when the target air inlet pressure is equal to or greater than a second set value, the target supercharging pressure is equal to the target air inlet pressure, and the second set value is greater than the first set value.
The further optimized technical scheme is as follows: the compensation pressure is obtained by calibrating a supercharging request coefficient.
The further optimized technical scheme is as follows: coefficient of boost request
Figure RE-GDA0002449586570000011
Wherein T isActuaActual torque at the current ignition efficiency; t ispredictMaxThe estimated torque under the current optimal ignition angle is obtained; t isRequestlThe torque is currently requested from the engine and is obtained by calibration.
The present invention determines whether to correct the target intake pressure to determine the target boost pressure through management of the target intake pressure, and the first set pressure may be determined based on the intake pressure when the improvement in the ignition efficiency is still not responsive to the torque request in the process of returning the requested torque from a lower value to a higher level in a short time. The method comprises the steps of correcting and compensating target intake pressure, judging whether to need early pressurization or not according to the current working condition, actually compensating on the basis of the traditional target pressurization pressure, determining a target pressurization pressure higher than the traditional target pressurization pressure in advance, meeting the requirement of torque in a short time, and meanwhile avoiding excessive compensation through a second set value in the compensation process of the target intake pressure (the target pressurization pressure) to realize the protection of a pressurization system. The invention improves the charging control and the air inlet pressure by increasing the target charging pressure, thereby improving the charging efficiency of the engine and improving the response of the torque.
The second technical scheme of the invention is as follows: a storage medium containing instructions for execution which, when processed by data processing means, perform the above-described method of determining a target boost pressure for an exhaust-gas turbocharged engine.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The following detailed description is provided for the purpose of explaining the claimed embodiments of the present invention so that those skilled in the art can understand the claims. The scope of the invention is not limited to the following specific implementation configurations. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
When the vehicle normally runs, the target boost pressure p _ boost des of the exhaust gas turbocharged engine is generally equal to the target intake pressure p behind the throttle valveDesLikewise, the conventional supercharging control is implemented. However, under some conditions, such as after the completion of the shift, the requested torque is restored from a lower value to a higher level in a short time, and if the engine intake air amount itself is low and the torque request cannot be responded by improving the ignition efficiency, the control is performed using the conventional target boost pressure, and the short-time requested torque cannot be satisfied.
As shown in FIG. 1, a target intake pressure p of the engine is obtainedDes(target value of post-throttle intake pressure), the target intake pressure can be obtained using conventional algorithms of existing PID supercharging closed-loop control.
When the target intake pressure pDesWhen the target boost pressure is less than the first set value, the target boost pressure is equal to the target intake pressure, i.e. p _ boost des ═ pDes. Since throttle control is more accurate and responsive, and the target intake pressure is lower than atmospheric pressure, the torque request can now be satisfied by adjusting the air quantity in response to the throttle. The first set value is the difference between the current atmospheric pressure value and the calibrated pressure value, and the calibrated pressure value of this embodiment is 40kPa, that is, the first set value is the current atmospheric pressure value minus 40 kPa.
When the target intake pressure pDesWhen the target boost pressure is larger than or equal to the first set value, the target boost pressure is equal to the sum of the target intake pressure and the compensation pressure, namely p _ boost des ═ pDes+ Δ p, Δ p is the compensation pressure.
Δ p is a compensation pressure based boost request coefficient
The compensation pressure Δ p depends on the actual torque T at the current actual firing efficiencyActuaCurrent engine requested torque TRequestlPredicted torque T of optimal ignition angle under current working conditionpredictMaxAnd target intake pressure pDesAnd (4) jointly determining.
1) According to the actual torque T at the current ignition efficiencyActualPredicted torque T at the current optimum ignition anglepredictMaxCurrent engine requested torque TRequestlDetermining a boost request coefficient
Figure RE-GDA0002449586570000031
Wherein
Figure RE-GDA0002449586570000032
The value range is between 0 and 1, and when the value is larger, K isPredictRatioThe larger; when in use
Figure RE-GDA0002449586570000033
When, KPredictRatioIf the target boost pressure p _ BoostDes is more than 1, the target boost pressure p _ BoostDes needs to be increased; otherwise, all the manifestations are opposite.
When K isPredictRatioWhen the pressure is more than 1, the target boost pressure p _ BoostDes needs to be increased; when K isPredictRatioThe larger the pressure is, the larger the target boost pressure p _ BoostDes is;
specific supercharging request coefficient KPredictRatioThe greater the request coefficient, the greater the drivability requirement is indicated, based on the response requirement to the fast torque request; and conversely, the request is smaller, which indicates that the requirement on the drivability is not high and the pursuit on the smoothness is higher.
Figure RE-GDA0002449586570000034
Figure RE-GDA0002449586570000041
2) Determining the compensation pressure delta p according to the supercharging request coefficient and the current target intake pressure
Δp＝f(pDes，KPredictRatio)
Figure RE-GDA0002449586570000042
And in the process of compensating the target charging pressure, when the target intake pressure is equal to or greater than a second set value, the target charging pressure is equal to the target intake pressure. The second set value is greater than the first set value. The second set point is a protection setting based on a limit value of the boost pressure of the supercharger system, i.e. the second set point is the difference between the maximum boost pressure of the supercharger system and a calibrated value. In the present embodiment, the maximum boost pressure of the boost system is 240kPa, the calibration value is 20kPa, that is, the second setting value is 220kPa, that is, in the process of compensating for the target boost pressure, when the target intake air pressure is equal to or greater than 220kPa, the pressure compensation cannot be performed any more, and Δ p is equal to 0. Which could otherwise cause surge in the supercharger and damage to the supercharger.
And finally, taking the corrected value of the target intake pressure p _ BoostDes of the supercharging control as the final target supercharging pressure, controlling the supercharger based on the target supercharging pressure, and realizing the supercharging control by adopting PID + I self-learning.
The above process can be completed by the data processing device engine controller ECU.

Claims (7)

1. A method for determining a target boost pressure of an exhaust gas turbocharged engine is characterized in that the target intake pressure of the engine is obtained, the target intake pressure is compared with a first set pressure, and whether the target intake pressure is corrected or not is determined to obtain the target boost pressure.
2. The method of determining a target boost pressure for an exhaust turbocharged engine as claimed in claim 1 wherein the target boost pressure is equal to the target intake pressure when the target intake pressure is less than the first set point.
3. The method of determining a target boost pressure for an exhaust turbocharged engine as claimed in claim 1 wherein the target boost pressure is equal to the sum of the target intake pressure and the offset pressure when the target intake pressure is equal to or greater than the first set value.
4. The method of determining a target boost pressure for an exhaust gas turbocharged engine as claimed in claim 3, wherein the target boost pressure is equal to the target intake pressure when the target intake pressure is equal to or greater than a second set value, which is greater than the first set value.
5. The method of determining a target boost pressure for an exhaust-gas turbocharged engine as claimed in claim 3, wherein the compensation pressure is calibrated by a boost request coefficient.
6. The method of determining a target boost pressure for an exhaust-gas turbocharged engine as claimed in claim 5 wherein the boost request coefficient
Figure FDA0002389491060000011
Wherein T isActualActual torque at the current ignition efficiency; t ispredictMaxThe estimated torque under the current optimal ignition angle is obtained; t isRequestlThe torque is currently requested from the engine and is obtained by calibration.
7. A storage medium comprising instructions for execution which, when processed by data processing means, cause the data processing means to carry out the method of determining a target boost pressure for an exhaust-gas turbocharged engine as claimed in any one of claims 1 to 4.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115355095A (en) * 2022-06-27 2022-11-18 东风汽车集团股份有限公司 Supercharging pressure control method for exhaust gas turbocharging engine and automobile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6318083B1 (en) * 1999-09-20 2001-11-20 Unisia Jecs Corporation Intake air control device of an engine with a charger and method thereof
JP2006342761A (en) * 2005-06-10 2006-12-21 Toyota Motor Corp Control device of internal combustion engine
CN103732878A (en) * 2011-08-23 2014-04-16 丰田自动车株式会社 Control device for internal combustion engine with turbo supercharger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6318083B1 (en) * 1999-09-20 2001-11-20 Unisia Jecs Corporation Intake air control device of an engine with a charger and method thereof
JP3926522B2 (en) * 1999-09-20 2007-06-06 株式会社日立製作所 Intake control device for turbocharged engine
JP2006342761A (en) * 2005-06-10 2006-12-21 Toyota Motor Corp Control device of internal combustion engine
CN103732878A (en) * 2011-08-23 2014-04-16 丰田自动车株式会社 Control device for internal combustion engine with turbo supercharger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115355095A (en) * 2022-06-27 2022-11-18 东风汽车集团股份有限公司 Supercharging pressure control method for exhaust gas turbocharging engine and automobile
CN115355095B (en) * 2022-06-27 2023-11-17 东风汽车集团股份有限公司 Boost pressure control method for configuring exhaust gas turbine supercharged engine and automobile

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